Minor self sighting.
I'm never at my best first thing in the morning and on this particular morning my brain appears to have melted. I needed to call up and pay my council tax so i got on the line and held while i waited for an operator.
Op: Ok, could i take your card number please.
Me: .....er...i am so sorry, but i forgot to get the damn thing.
*fumbles around trying to find it.*
All in all it took me five minutes to find the right card and i felt like a proper twit for not having it ready.